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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4562fdb2b8855018ed11a3fc71bd01d72fbe46db053cca89b31ad2e3912e4c53' 
  AND token = 'HvybfU++Ue+T3EfFZUhKGJF/OTW2lRHix5D1O3GafwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}